The key to an excercise I did suggested may in the following sentence:
Guests may leave their valuables at the hotel safe.
What would be the connotation of can used here, if possible?
Andrea, please try to learn to use quotes for can or words or sentences that you're quoting. It can take quite a while to work out the meaning of a sentence with can where you don't expect it.
Two of the three 'cans' in the above passage should be quoted.